Optimization of DWDM Demultiplexer Using Regression Analysis

Venkatachalam Rajarajan Balaji,Savarimuthu Robinson,Mahalingam Murugan

doi:10.1155/2016/9850457

Abstract

We propose a novel twelve-channel Dense Wavelength Division Multiplexing (DWDM) demultiplexer, using the two-dimensional photonic crystal (2D PC) with square resonant cavity (SRC) of ITU-T G.694.1 standard. The DWDM demultiplexer consists of an input waveguide, SRC, and output waveguide. The SRC in the proposed demultiplexer consists of square resonator and microcavity. The microcavity center rod radius (Rm) is proportional to refractive index. The refractive index property of the rods filters the wavelengths of odd and even channels. The proposed microcavity can filter twelve ITU-T G.694.1 standard wavelengths with 0.2 nm/25 GHz channel spacing between the wavelengths. From the simulation, we optimize the rod radius and wavelength with linear regression analysis. From the regression analysis, we can achieve 95% of accuracy with an average quality factor of 7890, the uniform spectral line-width of 0.2 nm, the transmission efficiency of 90%, crosstalk of −42 dB, and footprint of about 784 μm2.

Highlights

Fiber cable transfers the data for the long distance without loss, when compared to the coaxial transmission
The disadvantages of demultiplexers are overcome by replacing them with Photonics Integrated Circuits (PICs)
The novelty in proposed Dense Wavelength Division Multiplexing (DWDM) system drops the desired wavelength tuned with the radius of the inner rod (Rm), which is positioned in the microcavity

Summary

Introduction

Fiber cable transfers the data for the long distance without loss, when compared to the coaxial transmission. The DWDM demultiplexer using 2D PC has a T-shaped structure with line defects resonant cavity [12,13,14] and P-shaped single resonant cavity with different rod radius to drop different wavelengths [20] and, the multi-T-shaped structure with line/point defects [15,16,17], X-ring cavity [18], and resonant cavity/line defects [19]. In this paper, a new square ring resonant cavity/point defects based demultiplexer has been proposed and designed to work with constructive interferences that result in high transmission efficiency. In the demultiplexer for developing 12channel DWDM, we design a filter in a position to drop highintensity resonant wavelength on the influence of microcavity inner rod (Rm).

Photonic Crystal Geometry

Microcavity Design

Multichannel Filter Design

Simulation Results and Discussion

Optimization of Rods and Wavelengths in DWDM

Summary